Need Help With Webmin ACL

Hello expert friends,
We are trying to backup Webmin users and groups from 1 system and restore it on another system. While webmin users are getting restored, webmin groups are not getting backed up.
From the Webmin Interface > Backup Configuration > Backup; then backing up
- Webmin Configuration
- Webmin Servers Index
- Webmin Users
into a file, copying that file and restoring it on 2nd system. Users are visible on system 2 but not groups.

What is the additional I am supposed to do for getting Webmin Users and Groups transferred into second system?